Python使用Event线程间通信

使用threading.Event可以使一个线程等待其他线程的通知，

把这个Event传递到线程对象中，Event默认内置了一个标志，初始值为False。一旦该线程通过wait()方法进入等待状态，直到另一个线程调用该Event的set()方法将内置标志设置为True时，该Event会通知所有等待状态的线程恢复运行。

import threading  

import time  

 

class MyThread(threading.Thread):  

    def __init__(self, signal):  

        threading.Thread.__init__(self)  

        self.singal = signal  

 

    def run(self):  

        print "I am %s,I will sleep ..."%self.name  

        self.singal.wait()  

        print "I am %s, I awake..." %self.name  

 

if __name__ == "__main__":  

    singal = threading.Event()  

    for t in range(0, 3):  

        thread = MyThread(singal)  

        thread.start()  

 

    print "main thread sleep 3 seconds... "  

    time.sleep(3)  

 

    singal.set()

运行效果：

I am Thread-1,I will sleep ...

I am Thread-2,I will sleep ...

I am Thread-3,I will sleep ...

main thread sleep 3 seconds...

I am Thread-1, I awake...I am Thread-2, I awake...

 

I am Thread-3, I awake...